Replace vim.opt with vim.o (nvim-lua#1495)

* Replace vim.opt with vim.o

Because it offers a nicer interface and info on hover.
For now leave vim.opt when using the table interface (until vim.o
with tables is implemented)

* Add type hint for vim.opt.rtp

* Add a comment about using vim.opt instead of vim.o

Author: oriori1703

init.lua

@@ -102,7 +102,7 @@ vim.g.have_nerd_font = true
 vim.o.number = true
 -- You can also add relative line numbers, to help with jumping.
 --  Experiment for yourself to see if you like it!
-vim.opt.relativenumber = true
+vim.o.relativenumber = true
 
 -- Enable mouse mode, can be useful for resizing splits for example!
 vim.o.mouse = 'a'